Hi Renato, perhaps I can quickly help out here, negateIt() and scaleIt() are functions of the MQuaternion class, which you can find documented in the Maya API:
http://download.autodesk.com/global/docs/mayasdk2012/en_us/index.html Cheers! -André On Oct 5, 3:44 am, Renato Polimeno <[email protected]> wrote: > Hey Chad, that is a beatifull peace of code! > > Could you please tell me what are those functions <value>.negateIt() and > <value>.scaleIt() ? > Properties of python numbers I guess ?! Could you point me a doc link ? > > Again, thanks for sharing ! > > > > > > > > > > On Tue, Oct 4, 2011 at 6:50 PM, Chad Vernon <[email protected]> wrote: > > You could implement slerp function: > > > import math > > def quaternionSlerp(a, b, t): > > cos = quaternionDot(a, b) > > if cos < 0.0: > > cos = quaternionDot(a, b.negateIt()) > > theta = math.acos(cos) > > sin = math.sin(theta) > > > if sin > 0.001: > > w1 = math.sin((1.0 - t) * theta) / sin > > w2 = math.sin(t * theta) / sin > > else: > > w1 = 1.0 - t > > w2 = t > > aa = OpenMaya.MQuaternion(a) > > bb = OpenMaya.MQuaternion(b) > > aa.scaleIt(w1) > > bb.scaleIt(w2) > > > return aa + bb > > > def quaternionDot(q1, q2): > > return (q1.x * q2.x) + (q1.y * q2.y) + (q1.z * q2.z) + (q1.w * q2.w) > > > On Tue, Oct 4, 2011 at 2:47 PM, David Moulder > > <[email protected]>wrote: > > >> I don't know if slerp is correctly exposed but I can tell you that there > >> is a new api binding available in 2012. Maya API 2. Its a faster and more > >> friendly python api and the docs suggest that slerp is exposed correctly. > > >> On Tue, Oct 4, 2011 at 5:26 PM, a_adam <[email protected]> wrote: > > >>> Hi there, > > >>> just joined in here, and I'm looking forward to some good discussions! > >>> And of course I stumbled into a problem today which brought me here in > >>> the first place: I can't for the life of me trigger the slerp function > >>> from the MQuaternion class. > > >>> The API docs tell me that there are two slerps (odd enough), one > >>> considering spin and being marked as not exposed to scripting, and a > >>> simple one without a spin argument which should be accessable to > >>> scripting. It is this simpler version which I'm trying to get to work. > > >>> I've seen in this group's archive that slerp indeed does not seem to > >>> be not implemented in the Python wrapper. However, that post is over a > >>> year old, and I asked myself if Autodesk did anything for Maya 2012 to > >>> make this work? Or anyone found a workaround in the meantime? > > >>> Many thanks in advance for a quick hint, cheers! > > >>> -Andre > > >>> -- > >>> view archives:http://groups.google.com/group/python_inside_maya > >>> change your subscription settings: > >>>http://groups.google.com/group/python_inside_maya/subscribe > > >> -- > >> David Moulder > >>http://www.google.com/profiles/squish3d > > >> -- > >> view archives:http://groups.google.com/group/python_inside_maya > >> change your subscription settings: > >>http://groups.google.com/group/python_inside_maya/subscribe > > > -- > > view archives:http://groups.google.com/group/python_inside_maya > > change your subscription settings: > >http://groups.google.com/group/python_inside_maya/subscribe > > -- > ______________________________ > > -> Renato Polimeno > +55 11 7539 3615 > renatopolimeno.com <http://www.renatopolimeno.com> > <http://www.renatopolimeno.com/>facebook.com/renato.polimeno<http://www.facebook.com/renato.polimeno> > @renatopolimeno <http://www.twitter.com/renatopolimeno> -- view archives: http://groups.google.com/group/python_inside_maya change your subscription settings: http://groups.google.com/group/python_inside_maya/subscribe
